Environment-friendly microemulsion capable of being dispersed into nano liquid drops in situ and preparation method thereof

Abstract

The invention discloses an environment-friendly microemulsion capable of being dispersed into nano liquid drops in situ, and a preparation method and application thereof. The microemulsion comprises the following components in parts by weight: 18.5-45 parts of emulsifier, 5-10 parts of water, 0-3 parts of assistant and the balance of biodiesel, totaling 100 parts. The microemulsion has favorable high-temperature stability, solves the problem that the existing nano emulsion treating agent can easily fail in a severe environment, does not generate environmental pollution by using green degradable biodiesel as the raw material, and has favorable lubricating effect. Besides, the microemulsion can be dispersed into nano liquid drops in water in situ, and can perform favorable lubricating and plugging effects on micro/nano cracks in well drilling when being used as a treating agent of the water-base drilling fluid.

Description

technical field [0001] The present application relates to the field of water-based drilling fluids, in particular to an environment-friendly microemulsion capable of in-situ dispersion into nano-scale droplets and its preparation method and application. Background technique [0002] Water-based drilling fluid is a multiphase unstable mixture system, mainly including colloidal particles of bentonite, polymer, cellulose or lignite, etc. Nanoemulsion is used as a treatment agent for water-based drilling fluids, and has the following characteristics: 1. Surface effect, that is, it has a very large specific surface area and high surface activity; 2. Small size effect, that is, due to the smaller particle size, resulting in The specific surface area is significantly increased, causing changes in the macroscopic physical properties to change the properties of the drilling fluid colloid. Studies have found that nanoemulsions can not only improve the inhibition and lubricity of wate...

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Problems solved by technology

However, since the water-based drilling fluid contains a large amount of water, if the microemulsion is applied to the water-based drilling fluid, the composition content of the microemulsion will be changed, which may lead to the destruction of the microemulsion system, even if the microemulsion system is After being destroyed, it is diluted with water to form a nanoemulsion, and the internal phase content in the formed nanoemulsion is also very low, no more than 5%.

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